IOTA/IOTA-ES occultation update for (267) Tirza / UCAC2 40479878 event on 2009 Dec 04, 18:27 UT Visible from Summary ------- On 2009 Dec 04 UT, the 49 km diameter asteroid (267) Tirza will occult a 11.8 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 14.9 mag (the magnitude of the asteroid) for at most 3.6 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 34 * date and approx. time of event: 2009 Dec 04, 18:20 - 2009 Dec 04, 18:35 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 3.6 * Moon: 92 % sunlit, 19° distance * Sun: 167° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 1.95 * 1 sigma uncertainty interval [seconds]: +/- 6.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .064 +/- .062) * 1 sigma uncertainty ellipse (major, minor, PA): ( .064", .062", 88° ) * approx speed of asteroid's shadow [km/s]: 13.5811 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 40479878 by 267 Tirza on 2009 Dec 4 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 2 0 0 2 34 22 18 35 39 0 65 -13 2 49 1 2 19 43 3 46 5 .. .. .. 3 0 0 3 1 49 18 35 39 1 66 -14 3 16 27 2 47 11 4 13 27 1 50 4 4 0 0 3 29 6 18 35 39 3 66 -15 3 43 43 3 14 29 4 40 40 2 17 25 5 0 0 3 56 12 18 35 38 4 66 -17 4 10 47 3 41 36 5 7 41 2 44 36 6 0 0 4 23 6 18 35 38 5 66 -18 4 37 41 4 8 31 5 34 30 3 11 35 7 0 0 4 49 48 18 35 37 6 66 -19 5 4 22 4 35 14 6 1 7 3 38 22 8 0 0 5 16 18 18 35 36 7 66 -20 5 30 50 5 1 45 6 27 31 4 4 57 9 0 0 5 42 34 18 35 35 8 66 -21 5 57 5 5 28 2 6 53 42 4 31 19 10 0 0 6 8 36 18 35 33 9 66 -22 6 23 6 5 54 5 7 19 39 4 57 27 11 0 0 6 34 24 18 35 32 10 66 -23 6 48 53 6 19 54 7 45 21 5 23 21 12 0 0 6 59 57 18 35 30 11 66 -24 7 14 25 6 45 29 8 10 48 5 49 0 13 0 0 7 25 14 18 35 28 12 66 -25 7 39 41 7 10 47 8 35 59 6 14 23 14 0 0 7 50 16 18 35 26 13 67 -26 8 4 42 7 35 50 9 0 55 6 39 31 15 0 0 8 15 1 18 35 24 14 67 -27 8 29 25 8 0 37 9 25 33 7 4 23 16 0 0 8 39 30 18 35 22 15 67 -28 8 53 53 8 25 7 9 49 55 7 28 58 17 0 0 9 3 41 18 35 20 17 67 -29 9 18 2 8 49 19 10 14 0 7 53 16 18 0 0 9 27 35 18 35 17 18 67 -31 9 41 55 9 13 14 10 37 47 8 17 16 19 0 0 9 51 10 18 35 15 19 67 -32 10 5 29 9 36 51 11 1 15 8 40 59 20 0 0 10 14 27 18 35 12 20 67 -33 10 28 44 10 0 9 11 24 25 9 4 23 21 0 0 10 37 25 18 35 9 21 68 -34 10 51 41 10 23 9 11 47 17 9 27 28 22 0 0 11 0 4 18 35 6 22 68 -35 11 14 19 10 45 50 12 9 48 9 50 14 23 0 0 11 22 24 18 35 2 23 68 -36 11 36 37 11 8 11 12 32 1 10 12 41 24 0 0 11 44 23 18 34 59 24 68 -37 11 58 35 11 30 12 12 53 53 10 34 47 25 0 0 12 6 3 18 34 56 25 68 -38 12 20 13 11 51 53 13 15 26 10 56 34 26 0 0 12 27 22 18 34 52 26 69 -39 12 41 31 12 13 14 13 36 38 11 18 1 27 0 0 12 48 21 18 34 48 27 69 -40 13 2 28 12 34 14 13 57 29 11 39 7 28 0 0 13 8 59 18 34 44 28 69 -41 13 23 4 12 54 53 14 18 0 11 59 52 29 0 0 13 29 15 18 34 40 29 69 -42 13 43 19 13 15 11 14 38 9 12 20 16 30 0 0 13 49 10 18 34 36 30 69 -43 14 3 13 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9 26 117 0 0 18 2 39 18 25 3 69 292 -56 18 16 21 17 48 58 19 9 42 16 55 32 118 0 0 17 48 28 18 24 56 68 292 -55 18 2 11 17 34 45 18 55 37 16 41 14 119 0 0 17 33 54 18 24 48 67 292 -54 17 47 38 17 20 10 18 41 9 16 26 34 120 0 0 17 18 57 18 24 41 66 292 -53 17 32 43 17 5 12 18 26 19 16 11 31 121 0 0 17 3 38 18 24 34 65 292 -52 17 17 25 16 49 52 18 11 6 15 56 6 122 0 0 16 47 57 18 24 27 64 292 -51 17 1 44 16 34 9 17 55 31 15 40 18 123 0 0 16 31 53 18 24 20 63 292 -51 16 45 42 16 18 3 17 39 33 15 24 7 124 0 0 16 15 26 18 24 13 62 292 -50 16 29 17 16 1 36 17 23 13 15 7 34 125 0 0 15 58 38 18 24 6 61 292 -49 16 12 29 15 44 46 17 6 31 14 50 39 126 0 0 15 41 27 18 23 59 60 292 -48 15 55 20 15 27 34 16 49 27 14 33 22 127 0 0 15 23 55 18 23 52 59 292 -47 15 37 49 15 10 0 16 32 2 14 15 43 128 0 0 15 6 1 18 23 45 58 293 -46 15 19 56 14 52 5 16 14 14 13 57 42 129 0 0 14 47 45 18 23 38 57 293 -45 15 1 42 14 33 47 15 56 5 13 39 19 130 0 0 14 29 7 18 23 31 56 293 -44 14 43 6 14 15 9 15 37 35 13 20 35 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57 41 295 -28 9 23 45 8 55 6 10 19 34 7 59 10 146 0 0 8 45 38 18 21 52 40 295 -27 8 59 58 8 31 17 9 55 53 7 35 16 147 0 0 8 21 33 18 21 46 39 295 -26 8 35 55 8 7 11 9 31 55 7 11 6 148 0 0 7 57 13 18 21 41 38 295 -25 8 11 36 7 42 49 9 7 40 6 46 39 149 0 0 7 32 36 18 21 36 37 295 -24 7 47 1 7 18 11 8 43 10 6 21 56 150 0 0 7 7 44 18 21 30 36 295 -23 7 22 10 6 53 18 8 18 24 5 56 59 151 0 0 6 42 38 18 21 25 35 295 -22 6 57 4 6 28 10 7 53 23 5 31 46 152 0 0 6 17 16 18 21 21 34 295 -21 6 31 44 6 2 48 7 28 7 5 6 19 153 0 0 5 51 41 18 21 16 33 296 -20 6 6 10 5 37 12 7 2 38 4 40 39 154 0 0 5 25 53 18 21 11 32 296 -19 5 40 23 5 11 22 6 36 54 4 14 45 155 0 0 4 59 51 18 21 7 31 296 -18 5 14 23 4 45 20 6 10 58 3 48 38 156 0 0 4 33 38 18 21 2 30 296 -17 4 48 10 4 19 5 5 44 49 3 22 20 157 0 0 4 7 12 18 20 58 28 296 -16 4 21 45 3 52 38 5 18 28 2 55 49 158 0 0 3 40 35 18 20 54 27 296 -15 3 55 9 3 26 1 4 51 56 2 29 8 159 0 0 3 13 48 18 20 50 26 296 -14 3 28 23 2 59 12 4 25 13 2 2 16 160 0 0 2 46 50 18 20 46 25 296 -13 3 1 26 2 32 14 3 58 19 1 35 14 161 0 0 2 19 43 18 20 42 24 296 -11 2 34 20 2 5 6 3 31 16 1 8 3 162 0 0 1 52 27 18 20 39 23 296 -10 2 7 4 1 37 49 3 4 4 0 40 44 163 0 0 1 25 3 18 20 35 22 296 -9 1 39 41 1 10 25 2 36 43 0 13 16 164 0 0 0 57 31 18 20 32 21 296 -8 1 12 10 0 42 52 2 9 15 - 0 14 18 165 0 0 0 29 53 18 20 29 20 296 -7 0 44 32 0 15 13 1 41 39 - 0 42 0 166 0 0 0 2 8 18 20 26 19 296 -6 0 16 48 - 0 12 32 1 13 57 - 1 9 47 167 0 0 - 0 25 42 18 20 23 18 296 -5 - 0 11 2 - 0 40 23 0 46 9 - 1 37 40 168 0 0 - 0 53 37 18 20 21 17 296 -4 - 0 38 56 - 1 8 18 0 18 16 - 2 5 37 169 0 0 - 1 21 36 18 20 18 15 296 -3 - 1 6 55 - 1 36 18 - 0 9 41 - 2 33 38 170 0 0 - 1 49 39 18 20 16 14 296 -2 - 1 34 57 - 2 4 21 - 0 37 42 - 3 1 42 171 0 0 - 2 17 44 18 20 14 13 296 -1 - 2 3 3 - 2 32 26 - 1 5 46 - 3 29 49 Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 40479878 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 40 59.3444 DE: +24 31 59.684 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .055, .059 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (267) Tirza approx. diameter [km]: 49 approx. diameter ["]: .032 distance from Earth [AU]: 2.08500 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 828 number of rejected observations: 41 time covered by the observations: 1907 Nov 07 - 2007 Oct 04 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.020, 82° remarks: * orbital elements for (267) Tirza : Mean anomaly = 169.85650123 deg Arg. of pericenter = 195.93302581 deg Long. of node = 73.91250962 deg Inclination = 6.01008040 deg Eccentricity = 0.10212319 Semimajor axis = 2.77295018 AU Perihelion dist = 2.48976765 AU Mag: H = 10.07, G = 0.15 Epoch of elements : MJD 55169.76900000 TDT (2009 Dec 04.769) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 4 267 Tirza 18h 27.8m UT 11.8 5 40 59.344 24 31 59.68UCAC2 40479878 0.0 14.9 49 3.6 2.085 -2.359 3.19 94.5875 24.532 -99.36 -22.33 18.4639 -0.00485 -0.05229 -7.62815 0.75648 -0.00136 -0.00016 2000 167.77133320091125.00000195.933026 73.912510 6.0100800.10212319 2.7729502 2.489767710.5 5.00.15 RATE 2.1344740 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.064 0.062 88 2.95 0.063 0 54545.5020091204_479878 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 17:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org